Wash and dry apples.,Remove stems.,Insert a wooden skewer into stem of each apple.,In 3-quart saucepan, melt butter.,Stir in sugar, corn syrup and dash of salt.,Mix well.,Bring to boiling over medium heat, stirring constantly for 12 to 15 minutes.,Remove from heat; add vanilla.,______,Turn to coat.,Set on buttered baking sheet.,Chill.